Device for purifying a flow of liquid by means of ultraviolet radiation

A device for purifying a flow of liquid by means of ultraviolet radiation, comprising:

• an elongated ultraviolet lamp having electrical terminals at each end thereof;
• a generally tubular inner casing surrounding substantially said lamp, said casing being made of a material that allows transmission of ultraviolet radiation, said casing having an aperture at each end thereof from which said electrical terminals protrude;
• a generally tubular outer casing surrounding said inner casing and forming with said inner casing a flow passage of generally annular cross-section for accommodating said flow of liquid, said outer casing being made of opaque material and wherein said outer casing comprises an elongated tubular central portion and two end portions disposed respectively at both sides of said central portion, each of said end portions having a first aperture for receiving the corresponding end of said central portion, each of said end portions being provided with a lateral aperture receiving a male barbed hose fitting forming an inlet or outlet, one of said end portions being provided with a drain valve, the other of said end portions being provided with a breather valve, each of said end portions being provided with a second aperture opposite to said first aperture to receive a corresponding connector, said second aperture being provided on its inner portion with threads and with a bevelled edge for receiving a corresponding annular seal;
• two connectors disposed respectively at both ends of said device for securing said lamp and said inner casing with respect to said outer casing, each of said connectors comprising:
• an opaque electrical socket having a central cavity for receiving the corresponding terminal of the lamp;
• and
• a fixing means for securing the corresponding socket and seal with respect to said casings and lamp;
• said casings, said seals and said sockets being made of material resistant to degradation by ultraviolet radiation.